The baiji (Chinese: 白鱀豚; pinyin: báijìtún (help·info), Lipotes vexillifer, Lipotes meaning "left behind", vexillifer "flag bearer") is an extinct species freshwater dolphin, and is thought to be the first dolphin species driven to extinction due to the impact of humans. Since Baiji means 'white fin' in Chinese, it means 'white-finned dolphin'. In China, the dolphin is also called Chinese river dolphin, Yangtze River dolphin, whitefin dolphin and Yangtze dolphin. Nicknamed "Goddess of the Yangtze" (simplified Chinese: 长江女神; traditional Chinese: 長江女神; pinyin: Cháng Jiāng nǚshén), it was regarded as the goddess of protection by local fishermen and boatmen. It is not to be confused with the Chinese white dolphin or the finless porpoise.
This site contains all information about Baiji River Dolphin.